Final answer:
Nonrandom mating occurs when individuals mate with partners who are phenotypically similar to themselves. This can happen due to assortative mating based on physical traits or physical distance between individuals. Nonrandom mating can impact the genetic makeup of future generations.
Step-by-step explanation:
When people mate with partners who are phenotypically similar to them, nonrandom mating takes place. Nonrandom mating frequently takes place in this type of mating, known as assortative mating. People might select partners, for instance, based on physical characteristics like height, eye colour, or hair colour.
Physical location is a contributing factor in nonrandom mating. Not every person in a huge population dispersed over a wide geographic area will have equal access to every other person. It can be challenging for some people to mate with people who are different from them because they may live kilometres apart.
By favouring particular qualities and affecting the genetic composition of offspring, nonrandom mating can alter a population.